8000 gh-105481: refactor instr flag related code into a new InstructionFlags class by iritkatriel · Pull Request #105950 · python/cpython · GitHub
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gh-105481: refactor instr flag related code into a new InstructionFlags class #105950

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Merged
merged 5 commits into from
Jun 21, 2023
Merged

gh-105481: refactor instr flag related code into a new InstructionFlags class #105950

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gh-105481: refactor instr flag related code into a new InstructionFla…
iritkatriel Jun 20, 2023
a08ac66
code review comments
iritkatriel Jun 21, 2023
8fcd65f
make InstructionFlags a dataclass
iritkatriel Jun 21, 2023
d383eaa
remove __hash__ and __eq__
iritkatriel Jun 21, 2023
f34174d
hash the bitmap instead of the InstructionFlags object
iritkatriel Jun 21, 2023
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114 changes: 78 additions & 36 deletions Tools/cases_generator/generate_cases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -234,7 +234,61 @@ def assign(self, dst: StackEffect, src: StackEffect):
def cast(self, dst: StackEffect, src: StackEffect) -> str:
return f"({dst.type or 'PyObject *'})" if src.type != dst.type else ""

INSTRUCTION_FLAGS = ['HAS_ARG', 'HAS_CONST', 'HAS_NAME', 'HAS_JUMP']
@dataclasses.dataclass
class InstructionFlags:
"""Construct and manipulate instruction flags"""

HAS_ARG_FLAG: bool
HAS_CONST_FLAG: bool
HAS_NAME_FLAG: bool
HAS_JUMP_FLAG: bool

def __post_init__(self):
self.bitmask = {
name : (1 << i) for i, name in enumerate(self.names())
}

@staticmethod
def fromInstruction(instr: "AnyInstruction"):
return InstructionFlags(
HAS_ARG_FLAG=variable_used(instr, "oparg"),
HAS_CONST_FLAG=variable_used(instr, "FRAME_CO_CONSTS"),
HAS_NAME_FLAG=variable_used(instr, "FRAME_CO_NAMES"),
HAS_JUMP_FLAG=variable_used(instr, "JUMPBY"),
)

@staticmethod
def newEmpty():
return InstructionFlags(False, False, False, False)

def add(self, other: "InstructionFlags") -> None:
for name, value in dataclasses.asdict(other).items():
if value:
setattr(self, name, value)

def names(self, value=None):
if value is None:
return dataclasses.asdict(self).keys()
return [n for n, v in dataclasses.asdict(self).items() if v == value]

def bitmap(self) -> int:
flags = 0
for name in self.names():
if getattr(self, name):
flags |= self.bitmask[name]
return flags

@classmethod
def emit_macros(cls, out: Formatter):
flags = cls.newEmpty()
for name, value in flags.bitmask.items():
out.emit(f"#define {name} ({value})");

for name, value in flags.bitmask.items():
out.emit(
f"#define OPCODE_{name[:-len('_FLAG')]}(OP) "
f"(_PyOpcode_opcode_metadata[(OP)].flags & ({name}))")


@dataclasses.dataclass
class Instruction:
Expand All @@ -256,7 +310,7 @@ class Instruction:
output_effects: list[StackEffect]
unmoved_names: frozenset[str]
instr_fmt: str
flags: int
instr_flags: InstructionFlags

# Set later
family: parser.Family | None = None
Expand Down Expand Up @@ -285,18 +339,10 @@ def __init__(self, inst: parser.InstDef):
else:
break
self.unmoved_names = frozenset(unmoved_names)
flag_data = {
'HAS_ARG' : variable_used(inst, "oparg"),
'HAS_CONST': variable_used(inst, "FRAME_CO_CONSTS"),
'HAS_NAME' : variable_used(inst, "FRAME_CO_NAMES"),
'HAS_JUMP' : variable_used(inst, "JUMPBY"),
}
assert set(flag_data.keys()) == set(INSTRUCTION_FLAGS)
self.flags = 0
for i, name in enumerate(INSTRUCTION_FLAGS):
self.flags |= (1<<i) if flag_data[name] else 0

if flag_data['HAS_ARG']:
self.instr_flags = InstructionFlags.fromInstruction(inst)

if self.instr_flags.HAS_ARG_FLAG:
fmt = "IB"
else:
fmt = "IX"
Expand Down Expand Up @@ -495,7 +541,7 @@ class MacroInstruction:
initial_sp: int
final_sp: int
instr_fmt: str
flags: int
instr_flags: InstructionFlags
macro: parser.Macro
parts: list[Component | parser.CacheEffect]
predicted: bool = False
Expand All @@ -508,7 +554,7 @@ class PseudoInstruction:
name: str
targets: list[Instruction]
instr_fmt: str
flags: int
instr_flags: InstructionFlags


@dataclasses.dataclass
Expand All @@ -518,7 +564,6 @@ class OverriddenInstructionPlaceHolder:

AnyInstruction = Instruction | MacroInstruction | PseudoInstruction
INSTR_FMT_PREFIX = "INSTR_FMT_"
INSTR_FLAG_SUFFIX = "_FLAG"


class Analyzer:
Expand Down Expand Up @@ -787,7 +832,7 @@ def analyze_macro(self, macro: parser.Macro) -> MacroInstruction:
sp = initial_sp
parts: list[Component | parser.CacheEffect] = []
format = "IB"
flags = 0
flags = InstructionFlags.newEmpty()
cache = "C"
for component in components:
match component:
Expand All @@ -803,7 +848,7 @@ def analyze_macro(self, macro: parser.Macro) -> MacroInstruction:
for _ in range(ce.size):
format += cache
cache = "0"
flags |= instr.flags
flags.add(instr.instr_flags)
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At this point, in my optimizer work, I have a need to prevent one flag ("IS_UOP") from being propagated. How would you do that using the new API?

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We can add an arg to this function to tell it which flags to skip?

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Yeah, something like exclude: set[str] | None = None would work.

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Let's add it when we need it. I don't like adding code that is neither used nor tested.

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I can add it after I merge your code into gh-105924.

case _:
typing.assert_never(component)
final_sp = sp
Expand All @@ -817,9 +862,8 @@ def analyze_pseudo(self, pseudo: parser.Pseudo) -> PseudoInstruction:
# Make sure the targets have the same fmt
fmts = list(set([t.instr_fmt for t in targets]))
assert(len(fmts) == 1)
flags_list = list(set([t.flags for t in targets]))
assert(len(flags_list) == 1)
return PseudoInstruction(pseudo.name, targets, fmts[0], flags_list[0])
assert(len(list(set([t.instr_flags.bitmap() for t in targets]))) == 1)
return PseudoInstruction(pseudo.name, targets, fmts[0], targets[0].instr_flags)

def analyze_instruction(
self, instr: Instruction, stack: list[StackEffect], sp: int
Expand Down Expand Up @@ -1067,13 +1111,8 @@ def write_metadata(self) -> None:

# Write type definitions
self.out.emit(f"enum InstructionFormat {{ {', '.join(format_enums)} }};")
for i, flag in enumerate(INSTRUCTION_FLAGS):
self.out.emit(f"#define {flag}{INSTR_FLAG_SUFFIX} ({1 << i})");
for flag in INSTRUCTION_FLAGS:
flag_name = f"{flag}{INSTR_FLAG_SUFFIX}"
self.out.emit(
f"#define OPCODE_{flag}(OP) "
f"(_PyOpcode_opcode_metadata[(OP)].flags & ({flag_name}))")

InstructionFlags.emit_macros(self.out)

self.out.emit("struct opcode_metadata {")
with self.out.indent():
Expand Down Expand Up @@ -1153,25 +1192,28 @@ def write_pseudo_instrs(self) -> None:
self.out.emit(f" ((OP) == {op}) || \\")
self.out.emit(f" 0")

def emit_metadata_entry(self, name: str, fmt: str, flags: int) -> None:
flags_strs = [f"{name}{INSTR_FLAG_SUFFIX}"
for i, name in enumerate(INSTRUCTION_FLAGS) if (flags & (1<<i))]
flags_s = "0" if not flags_strs else ' | '.join(flags_strs)
def emit_metadata_entry(
self, name: str, fmt: str, flags: InstructionFlags
) -> None:
flag_names = flags.names(value=True)
if not flag_names:
flag_names.append("0")
self.out.emit(
f" [{name}] = {{ true, {INSTR_FMT_PREFIX}{fmt}, {flags_s} }},"
f" [{name}] = {{ true, {INSTR_FMT_PREFIX}{fmt},"
f" {' | '.join(flag_names)} }},"
)

def write_metadata_for_inst(self, instr: Instruction) -> None:
"""Write metadata for a single instruction."""
self.emit_metadata_entry(instr.name, instr.instr_fmt, instr.flags)
self.emit_metadata_entry(instr.name, instr.instr_fmt, instr.instr_flags)

def write_metadata_for_macro(self, mac: MacroInstruction) -> None:
"""Write metadata for a macro-instruction."""
self.emit_metadata_entry(mac.name, mac.instr_fmt, mac.flags)
self.emit_metadata_entry(mac.name, mac.instr_fmt, mac.instr_flags)

def write_metadata_for_pseudo(self, ps: PseudoInstruction) -> None:
"""Write metadata for a macro-instruction."""
self.emit_metadata_entry(ps.name, ps.instr_fmt, ps.flags)
self.emit_metadata_entry(ps.name, ps.instr_fmt, ps.instr_flags)

def write_instructions(self) -> None:
"""Write instructions to output file."""
Expand Down
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